[flink] 02/09: [hotfix] Add FunctionUtils#uncheckedFunction to convert FunctionWithExcpetion into Function

[tr...@apache.org]

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trohrmann pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/flink.git

commit 6f1fbd207c6883ca17b131ae83871a7034ccd6f9
Author: Till Rohrmann <tr...@apache.org>
AuthorDate: Tue Sep 11 14:24:18 2018 +0200

    [hotfix] Add FunctionUtils#uncheckedFunction to convert FunctionWithExcpetion into Function
---
 .../apache/flink/util/function/FunctionUtils.java  | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/flink-core/src/main/java/org/apache/flink/util/function/FunctionUtils.java b/flink-core/src/main/java/org/apache/flink/util/function/FunctionUtils.java
new file mode 100644
index 0000000..c15ece1
--- /dev/null
+++ b/flink-core/src/main/java/org/apache/flink/util/function/FunctionUtils.java
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.util.function;
+
+import org.apache.flink.util.ExceptionUtils;
+
+import java.util.function.Function;
+
+/**
+ * Utility class for Flink's functions.
+ */
+public class FunctionUtils {
+
+	private FunctionUtils() {
+		throw new UnsupportedOperationException("This class should never be instantiated.");
+	}
+
+	/**
+	 * Convert at {@link FunctionWithException} into a {@link Function}.
+	 *
+	 * @param functionWithException function with exception to convert into a function
+	 * @param <A> input type
+	 * @param <B> output type
+	 * @return {@link Function} which throws all checked exception as an unchecked exception.
+	 */
+	public static <A, B> Function<A, B> uncheckedFunction(FunctionWithException<A, B, ?> functionWithException) {
+		return (A value) -> {
+			try {
+				return functionWithException.apply(value);
+			} catch (Throwable t) {
+				ExceptionUtils.rethrow(t);
+				// we need this to appease the compiler :-(
+				return null;
+			}
+		};
+	}
+}